Lately, the sources of radical and rebellious Roman Catholic thinking is the staid and sober Netherlands. The latest incident to alarm Rome’s Holy Office involves a lively magazine.

The sources of radical and rebellious Roman Catholic thinking used to be the industrial missions in urban France or the theological faculties of German universities. Lately, the fount of ideas that may skirt heresy — or may become the accepted reshaping of church thinking — is the staid and sober Netherlands.

The…